Method for making stabilised polyamide compositions

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...

Reexamination Certificate

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C524S717000, C524S718000, C524S719000, C524S720000, C524S736000, C524S732000, C524S738000, C524S739000, C524S740000, C524S741000, C528S310000, C528S312000, C528S313000, C528S314000, C528S319000, C528S337000

Reexamination Certificate

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07074851

ABSTRACT:
The invention relates to a process for preparing stabilized compositions based on polyamide. The stabilizer is a phosphorus stabilizer selected from phosphorous acid and hypophosphorous acid. It is introduced before or during the polymerization of the polyamide. The use of these stabilizers prevents foaming phenomena.

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